website: add grunt watch task
website: add grunt watch task

FauDroids/XmasCalendar,FauDroids/XmasCalendar,FauDroids/MyAdvent,FauDroids/MyAdvent,FauDroids/XmasCalendar,FauDroids/MyAdvent,FauDroids/MyAdvent,FauDroids/XmasCalendar